/*
 * Copyright 2022 CloudWeGo Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2015-present Aliaksandr Valialkin, VertaMedia, Kirill Danshin, Erik Dubbelboer, FastHTTP Authors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * This file may have been modified by CloudWeGo authors. All CloudWeGo
 * Modifications are Copyright 2022 CloudWeGo Authors.
 */

package ext

import (
	"errors"
	"fmt"
	"io"

	errs "github.com/cloudwego/hertz/pkg/common/errors"
)

var (
	errNeedMore     = errs.New(errs.ErrNeedMore, errs.ErrorTypePublic, "cannot find trailing lf")
	errBodyTooLarge = errs.New(errs.ErrBodyTooLarge, errs.ErrorTypePublic, "ext")
)

func HeaderError(typ string, err, errParse error, b []byte) error {
	if !errors.Is(errParse, errs.ErrNeedMore) {
		return headerErrorMsg(typ, errParse, b)
	}
	if err == nil {
		return errNeedMore
	}

	// Buggy servers may leave trailing CRLFs after http body.
	// Treat this case as EOF.
	if isOnlyCRLF(b) {
		return io.EOF
	}

	return headerErrorMsg(typ, err, b)
}

func headerErrorMsg(typ string, err error, b []byte) error {
	return errs.NewPublic(fmt.Sprintf("error when reading %s headers: %s. Buffer size=%d, contents: %s", typ, err, len(b), BufferSnippet(b)))
}
